Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA2002HIGHLANDER 4WD L4-2.4L (2AZ-FE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMTESTING AND INSPECTIONON-VEHICLE INSPECTION
2002 Toyota Highlander 4WD L4-2.4L (2AZ-FE)
On-Vehicle Inspection
2002 Toyota Highlander 4WD L4-2.4L (2AZ-FE)SECTION On-Vehicle Inspection
ON-VEHICLE INSPECTION
NOTE: "Cold" and "Hot" in these sentences express the temperature of the coils themselves. "Cold" is from -10 °C (14 °F) to 50 °C (122 °F) and "Hot" is from 50 °C (122 °F) to 100 °C (212 °F).
1. INSPECT IGNITION COIL (WITH IGNITER) AND SPARK TEST
a. Confirm DTC.
NOTE: If DTC is indicated, carry out troubleshooting in accordance with the procedure on the following DTC.
b. Check that the spark occurs.
1. Remove the cylinder head cover No.2.
2. Remove the ignition coils (with igniter).
3. Using a 16 mm (0.63 in) plug wrench, remove the all spark plugs.
4. Install the spark plugs to each ignition coils (with igniter), and connect the ignition coil connectors.
5. Disconnect the all injector connectors.
6. Ground the spark plugs.
7. Check if spark occurs while engine is being cranked.
NOTE:
- Be sure to ground the spark plug, when checking.
- Replace the ignition coil when it is given an impact.
- Do not crank the engine for more than 2 seconds.
If the spark does not occur, do the test as follow.
c. Using a 16 mm (0.63 in.) plug wrench, install the spark plugs.
Torque: 19 N.m (194 kgf.cm, 14 ft.lbf)
d. Install the ignition coil with igniter.
Torque: 9.0 N.m (92 kgf.cm, 80 in.lbf)
FLOW CHART IN CASE THAT NO SPARK OCCURS
NOTE: "Cold" and "Hot" in these sentences express the temperature of the coils themselves. "Cold" is from -10 °C (14 °F) to 50 °C (122 °F) and "Hot" is from 50 °C (122 °F) to 100 °C (212 °F).
1. INSPECT IGNITION COIL (WITH IGNITER) AND SPARK TEST
a. Confirm DTC.
NOTE: If DTC is indicated, carry out troubleshooting in accordance with the procedure on the following DTC.
b. Check that the spark occurs.
1. Remove the cylinder head cover No.2.
2. Remove the ignition coils (with igniter).
3. Using a 16 mm (0.63 in) plug wrench, remove the all spark plugs.
4. Install the spark plugs to each ignition coils (with igniter), and connect the ignition coil connectors.
5. Disconnect the all injector connectors.
6. Ground the spark plugs.
7. Check if spark occurs while engine is being cranked.
NOTE:
- Be sure to ground the spark plug, when checking.
- Replace the ignition coil when it is given an impact.
- Do not crank the engine for more than 2 seconds.
If the spark does not occur, do the test as follow.
c. Using a 16 mm (0.63 in.) plug wrench, install the spark plugs.
Torque: 19 N.m (194 kgf.cm, 14 ft.lbf)
d. Install the ignition coil with igniter.
Torque: 9.0 N.m (92 kgf.cm, 80 in.lbf)
Step 1 - 2:
Step 3:
FLOW CHART IN CASE THAT NO SPARK OCCURS
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.